Tanner on the divine concursus

"it makes as much sense to deny there are created powers and efficacy because God brings about all that is, as to deny there is a creation because there is a creator. It makes no sense at all, for the same reason in both cases--one would be denying the existence of an effect because of the existence of a cause."

Kathryn Tanner, God and creation in Christian theology: tyrrany or empowerment? (Oxford: Basil Blackwell, 1988), 86. First sentence is spot on; second sentence doesn't by itself make it sufficiently clear that in the first we are talking about a "cause" unlike any other, and utterly transcendent (though Tanner does this often enough elsewhere).